KAZOO-2563: only use auth doc from couch/cache and current timestamp to
determine whether to save the auth doc with updated pvt_modified timestamp
KAZOO-2563: add lang metadata to user auth
KAZOO-2563: add ability to delete your own auth token
KAZOO-2563: remove saved docs from local couch cache
KAZOO-2563: add token_auth doc page
KAZOO-2563: fix setting pvt fields on token
KAZOO-2563: added auth_token restrictions docs
KAZOO-2563: clean up unused vars
KAZOO-2563: use auth doc from context

remove suppression of change notice

put expiry percentage to system_config doc
KAZOO-2563: remove explicit flushing after save
Merge pull request #379 from 2600hz/KAZOO-2563

Kazoo 2563